Another method of dating a tweed Fender Champ is by serial number.
On my 1959 tweed Champ amplifier, the serial number is located right in front of the fuse cap.
only come into play when you’re trying to value the amplifier in the Blue Book for Guitar Amplifiers per the model description that is provided.
The first amplifiers made in-house by Fender is the Woodie series, built in 1946 through 1948.
They included the Model 26 Deluxe, the Princeton, and the Professional.
Fender amplifiers began making a name for themselves with the Tweed series, so called because of their cloth covering, which is actually varnished cotton twill (tweed is a coarse woollen fabric, commonly used for jackets, coats and caps; it is often woven in a twill pattern, which is likely the reason for the confusion over naming.) They were produced for more than a decade and are now eminently collectible and praised for their sound quality.
Leo Fender began building guitar amps before he started manufacturing guitars.
The first of these amps were the K&F models, which were produced between 19.